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Java Forum / General / August 2007reverse engineering of java code
hi guys, iam developing an application which takes input as ". java/.cpp"[i.e java/cpp source code] and gives output as " classes , sub classes,objects,methods" of that source code. can you guys help me out, is there ready made method, classes ,packages to implement this?. can you suggest me how to proceed. hey pls don't comment on simplicity of problem, iam newbie. > hi guys, > iam developing an application which takes input as ". > java/.cpp"[i.e java/cpp source code] and gives output as " classes , > sub classes,objects,methods" > of that source code. Java != C++. (Java and C++ are not the same) Java !< C++. (Java is not a strict subset of C++) Java !> C++. (Java is not a strict superset of C++) No code that is capable of handling Java or C+ cannot handle the other without some (often major) modifications. > can you guys help me out, is there ready made method, > classes ,packages to implement this?. That said, there are two ways to do this: 1. Go through the JLS 3 and right your own lexer and parser that manually looks for the class, method, and field (I presume that is what you meant by 'objects') expressions. 2. Pipe the source code through a Java compiler and parse the resultant class file for the class, subclasses, fields, and methods. > can you suggest me how to proceed. > hey pls don't comment on simplicity of problem, iam newbie. Simple, this? You're talking about either implementing a LALR parser or interfacing a compiler whether through the runtime compiler interface new to Java 6, the undocumented Java 5 (and older) compiler interface in tools.jar, or running a subprocess and then parsing a class file (the spec (chapter 4 of the JVM spec 2 1.5 addendum is only ~ 80 pages long; Java 6's addendum is another 100 or so pages on that). In short, this is not a task for a "newbie" to work on. The best way to proceed is to wet your feet on simpler topics. Roedy has some pages about simple projects for beginners (see several other threads for links).  SignatureBeware of bugs in the above code; I have only proved it correct, not tried it. -- Donald E. Knuth On Tue, 21 Aug 2007 15:40:31 GMT, Joshua Cranmer <Pidgeot18@verizon.net> wrote, quoted or indirectly quoted someone who said : >The best way to proceed is to wet your feet on simpler topics. Roedy has >some pages about simple projects for beginners (see several other >threads for links). see http://mindprod.com/project/projects.html for project ideas. They are graded by difficulty, financial potential and how many existing implementations there are. I find it odd so many people tackle projects where there are over:20 implementations already, e.g. SQL engine, servlet womb, drawing package, rules engine, xml parser. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > On Tue, 21 Aug 2007 15:40:31 GMT, Joshua Cranmer > <Pidgeot18@verizon.net> wrote, quoted or indirectly quoted someone who [quoted text clipped - 11 lines] > implementations already, e.g. SQL engine, servlet womb, drawing > package, rules engine, xml parser. Deciding whether the task is feasible, and its approximate scope, is a difficult part of project selection. If there is at least one existing implementation there is a proof by example that it can be implemented in no more than N lines of Java for some N. Patricia >Deciding whether the task is feasible, and its approximate scope, is a >difficult part of project selection. If there is at least one existing >implementation there is a proof by example that it can be implemented in >no more than N lines of Java for some N. Sometimes it is even possible to peak at existing code, or disassembler it. I still think re-inventing the wheel with only trivial changes is cowardly and a waste of time. There are SO many projects out there with no implementations at all or with just utterly inept implementations. I have listed many of them at http://mindprod.com/project/projects.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > hi guys, > iam developing an application which takes input as ". [quoted text clipped - 5 lines] > can you suggest me how to proceed. > hey pls don't comment on simplicity of problem, iam newbie. By far the simplest way to do this is to compile the Java source and use reflection (see java.lang.reflect) on the result. > hi guys, > iam developing an application which takes input as ". [quoted text clipped - 5 lines] > can you suggest me how to proceed. > hey pls don't comment on simplicity of problem, iam newbie. There are already lots of applications that can do this. One such program is included with the JDK: javap. Although, it's slightly different in that you run it against .class files instead of .java files. javap <class name>. For example, javap java.lang.Object outputs: Compiled from "Object.java" public class java.lang.Object{ public java.lang.Object(); public final native java.lang.Class getClass(); public native int hashCode(); public boolean equals(java.lang.Object); protected native java.lang.Object clone() throws java.lang.CloneNotSupportedException; public java.lang.String toString(); public final native void notify(); public final native void notifyAll(); public final native void wait(long) throws java.lang.InterruptedException; public final void wait(long, int) throws java.lang.InterruptedException; public final void wait() throws java.lang.InterruptedException; protected void finalize() throws java.lang.Throwable; static {}; } SignatureJoe Attardi jattardi@gmail.com > > hi guys, > > iam developing an application which takes input as ". [quoted text clipped - 38 lines] > Joe Attardi > jatta...@gmail.com thanx a lot for quick and sincere support. > hi guys, > iam developing an application which takes input as ". > java/.cpp"[i.e java/cpp source code] and gives output as " classes , > sub classes,objects,methods" > of that source code. Doxygen? <http://www.stack.nl/~dimitri/doxygen/> > can you guys help me out, is there ready made method, > classes ,packages to implement this?. > can you suggest me how to proceed. > hey pls don't comment on simplicity of problem, iam newbie. >hi guys, > iam developing an application which takes input as ". [quoted text clipped - 5 lines] > can you suggest me how to proceed. >hey pls don't comment on simplicity of problem, iam newbie. See http://mindprod.com/jgloss/decompiler.html http://mindprod.com/jgloss/disasssembler.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. 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